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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bb86f2907228dbc6db488dc6c8642333f62eefdeea11087f7aa8557c279207' 
  AND token = 'IxnR+/IN26X3Qy9+U+5DGfLuBcmDpP1/e7B3s8YOalU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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