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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10eab475c5e5efd24371e631933c91de1c41a3f9d9ed40e8249597aa23d73fc4' 
  AND token = '3yObQiVFmDTUZRpP/zWOyniJTP5zW3w/NyS4Y1l6nHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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