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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c207f39931fb4e38a807349a80d72038b2d98b76f09df77beeae8db5857a41' 
  AND token = 'EMZoHk/B8P3YEJ0vhwH5qmUiZkLy2OHdXQHCYE6n0Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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