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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3407dd53e9ba20017e7155c9e94d3aae40e1dbfe46b3dfd551c7a4b0940a84dc' 
  AND token = '+hBX2USf7jryPm03a0+/NjchzosKzi0QR3v4gIQ7xaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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