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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470b0fe4e765feb9e3b54ba3e5ff8eb59b72b89b71e30a56f4ad1d0bbb385fc8' 
  AND token = 'cHKf/yor6dQ6M4o3AqZtRZAZc0jyPGWJi0ZxgF6izjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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