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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfb889a37911f7c1aef0f9e305fb9454af2d86653e2c4a9b3b705fcab7a407d' 
  AND token = 'Bs+ph4DCnT5dgU73P+DWi79eQG9sAhytdA8pl1cGuKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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