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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c4f8d3930580cf81866f2586a723c16412af7ef6d761fc1392d7aec49f7fea' 
  AND token = 'H6XBKCrSrFy9MW4abpyZQP6dg7+Y3dkOUU6Weyyodbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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