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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa7e489f65cf7c6a21f34d4176fd29110891674d8cc94d24ffde88cd9aed101' 
  AND token = 'fSPKt0O9tY6WLc98K2/Ua7fc6Sw+kG3ISu2YhaTBp/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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