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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb82a8b0bb3c87e0807257c7f9bcd8589093415e940f35b53d0617195bc8cc27' 
  AND token = 'jeg8fQDBZfxzjntR7xEGsl6ARzyQtu3VSTK69PqjauI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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