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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4d093b602f19ab67168ea724c6d2ef4810baceb176ef7a93f010b2925688f7' 
  AND token = '3gx5QFYnhENe/2emWyJd3wXpmCKhu12eG+jiu2m/34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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