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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adb58840e3c51e524647d2ba5fe93ea6960850e4e61d7c306728bfe6d8bc0ac' 
  AND token = 'BpkJ+8WCekB+y5R9d4QBUzoL2G2InxTj5BRRzJLJhG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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