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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf7216dee78b262413fc540db9be8143af0774e23ce557f3abfcbe3b1b955c5' 
  AND token = '9qMu89W5Mgu25nz0TAdNJ+ipC0/je6Cib0nDYC6Leow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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