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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557390943f7bcacbe578fcc30bf591d6903a49a1938979eb319679b8ba37ba6f' 
  AND token = 'dbKCZ2XtW47crqIJUpbJy0w7/vXhWmRQ/Lwl6fQFVCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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