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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab0834e259e509d4dcb2caadb5bb66e5bb58a3740033ae00693a12790c49ec6' 
  AND token = '82UQvbq9SgiCVYXcuZAqau6z+Ghz9K3BN6bSrR+zcqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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