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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be138f36d7582f95215276edf7c5445768cabb4e4a1656f429166fdd0783941' 
  AND token = 'Fa2RmN2v7xEj0GysR/OWP7l6GiPpDWoWGJ8JedeGMeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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