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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4aaddd635e360448ab468e0f01ae5a858864d2fd2900a3af38bd3c5acfa153' 
  AND token = 'TpmtDOVfbMWFwWEsjm0oxklB0tg+S6a9g6fqxNGNX74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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