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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c203518ab9b1bb379d280f375e10e7ed5d9411eb7eb93ce165153f9a2913d7' 
  AND token = 'GnZt/+2Ag+59WkRL5fwpx+4uG8vo53kbMe3m98RBUgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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