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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfec974386fdf817218b2d5e25eb959ee5e7f54c97143da4e6da71a919ffa06' 
  AND token = 'SJM1lN0wJWU+fBKW0hVoR64g4EOHHR7FHq+D6LAyzho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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