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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6b22e4e60391f597d1d70b6b7d087c32b570331d6cb98f2dd2ef69bc1027c' 
  AND token = '6ra6ShnhYeFuuxlZn+yXAK+8Jy8rBKDK54NK0MMj/yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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