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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd0cc599ccfb7a2ebfa56ca83e8bb4606e93ba33b0e1965bdefcf96f5a70571' 
  AND token = 'VnPb5yc6BpTGyUVJAmPAQhEsoAND+GXZVir7tsDV130=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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