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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f6ee018d05cc17f7f8449223bf01a8da3a18dd4f359c818b5c82e2dee0d5db' 
  AND token = '2AmMq98d56kP7izRg++u+w47uw4M9/BzCNJ9haH5+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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