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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1caa09b449cb1ff5b68e71e503a43f75d6c46af7cdd8ce97d6510e2f5484d8d' 
  AND token = 'rdRVN03y3beQaU9XAMngkHo5kWQl2n5j9rGp1k4dk/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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