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SELECT 
  1 
FROM 
  csscart_lock_keys 
WHERE 
  key_id = '8dae720464208980d86ad3f3379708d7bb4f4816162b5b87f0a13982cf272a68' 
  AND token = 'gWm7xmR5A5ztTW7rDN4eLIEMK4jWGWafT5hz8jW9KHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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