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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8805633443bd668b80b447007e059baab2942ad9c917f7d0893a3a51bc68e6' 
  AND token = 'pHb0FZQFptK17J7lNAsUqlG7P2emUcVEecPfPlFtZfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}