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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf5f9c32771dfd2e8b412d79ef6f35013af4d6320c20f0206011e2aaffa5cff' 
  AND token = 'hJm3th1zNYpbUJfmO1k0dXIK/2ivf8GYBbEX8LJPg6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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