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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15834f1626039ad75027f2afc51aeb31ac219d5db3ce47fa5f59b247f884a23' 
  AND token = 'dRDfe4aa29jd9fD1N3J4PW+RPz51n6A8vd2Jov92TtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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