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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae71a1e5ae56823eb78ed7674d2b15b246cba5066a9fe70b2b712aaebdf5172' 
  AND token = '+nOk52SL3sbNDg6rXeDHO+EFxyM6b2UxAruuZF6BAn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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