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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01c461b216cd021aa2b186b88b6ae990e0d66f78781b009325ac21657069f52' 
  AND token = 'QBngTUCHa0u0y74g5z1G8t5rTPVE9j27ykYAsD8qPpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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