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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ca521df88d7a1e9e14692db086dceed3ab18a9fe44bfccc8e34b45f7e54c13' 
  AND token = 'XI+/2H5ZEE4AbEjVZ3UXY+tXaQ4vK7A8JI8+bhpxO8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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