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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48f961af77b2768d66c88fd1baab8bcba5e7077539bf739c7561de76c682e68' 
  AND token = 'xImbQzc4DlwGlFttmLlYHtS/ese4sHdBosbi9Fj87eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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