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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1117cbd6afc3c8abc00953879f0973ef804ecca9dff94a110fd5bd7b2786cac8' 
  AND token = 'u+6sc7+cuj2LYIkTthzZw0C1ju9SGc+JasLC+NC4z0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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