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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3003fa23494e94a4750532fba0e8de39de4d849d2246392b12ada952bac3618' 
  AND token = 'r4tSFE7q0J+nfq+YwQdPp2SZYQMFMNJf+dxO32+mNdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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