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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ad8492f2606edcc8751538204c2ee47c1ed33d2b77b33237a38ea019fd3ea6' 
  AND token = 'ilFI/sEmKp/IYmmeelOFQWyulq/Oz0Z9x3yXGWxtdAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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