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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce9f31f0a9c3d5b8869fd93c4b24e318c5f6cae44a845b5f0325eefe64156db' 
  AND token = 'Yi4vzdis54x1gSYXak3EhAqqJ03lfpePNYB6Qug3Lvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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