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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97146e9d212eb127cd04912c5c125defd44973c54531f5e3891c9c0e40080e16' 
  AND token = 'i3/2esYccSWCQVWTZ2W2qghTnmfcaSINk1DwXUhu81w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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