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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62e24cd17064658d0aad4859ef70c84aec0842d72d1cfaad1853196ac2b805e' 
  AND token = 'BqAkBlNLDI4oui3Exhrki2n0d8qR3Ns9wj5RtYKjv0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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