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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d07b3c6ebbaae57073afc7db24bc162c2b488cb8bdf5f855d0d03e38f4fde6' 
  AND token = '4W/yCd13Vf244ttpwT8DCGxXs+Z/YhEhtfLoiVa/qHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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