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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32141cdf86ca1940b285cf3c8eea3bd9bd6028db2eca3670966cdaecc18cdf6d' 
  AND token = 'JrFZZFqGorOkA6R8fxtoF6kUqY0d3E0CWEkurM913bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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