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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0390a310374aa13453b8a949c30c0f41f585bcac3338ab9641bf551ce6ec22' 
  AND token = 'kHda0psnhczafu+Wr3FElJNbicJPCk+A1lxphK30g7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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