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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574d8c52d344fd23293768d8710f6ce06692fa28bf6149fab6a39a5311a26282' 
  AND token = '6U9c0Si3g6VEse7oOMSJR3jiQIgwOrjIr8WdbssA9QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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