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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d177c1ad7b591173527abab5a10150080d4c1d3b1cdc44fee2f1c857f03cae' 
  AND token = '/ezl302WmZ9W1FVpgx5l2xAeW3PxcU79orc+072iX9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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