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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e3ea8133df31173c6768edc7f8069907ff3b4ca07ba4400090854cc0b655d1' 
  AND token = 'gYI6khJYVLZxjy7EBdT8zL4xp60R0lSw0fOCxpDaUC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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