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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7906c0d8ba8e2e14e2ad12570f97cc37c9dd7d7dbc8baa6e650e0781d25ee2b' 
  AND token = '3lga5Hd1VL1ZmCVtjF/1fQQXTiSDU1lxWsYqke4jBzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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