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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee11fe96a4b83c1819c7da9d465c5b75a7827ff135c4e3be32bc4372c3733be9' 
  AND token = 'hhpGSrHivyq6IpDr628qb1qoef7aZa70C0jFDGFYzY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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