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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353621db7d0de0d6d9524424dfe8aa1d26a3b312cce5dad10082f5a7809edb4c' 
  AND token = 'Huw2+lSh2babTvX8V3TIvRfgTARq270AdVqCxdYHcXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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