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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb46a6ed6250f02fcddcb0aca4d079e75370a9091b49c0d2cd637d7b7200e84b' 
  AND token = 'xvFfRYjOoi6PXUibCfAYlPO8NZ99WtEkjCBcNs03dgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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