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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b604c03de9f23da9530e08195c2206dcecaab2a4d101db1d6b5292b2c6218077' 
  AND token = 'UbVUs8Py8wOpYJ+EzjhN4+TLoSTUuByNId2D7hmoYZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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