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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd3c0ed77af93a52256d7c9f5bb015fe201baeecb5b7ac3cec2d83207a33906' 
  AND token = '36bCe/QzGCbG7O8+NgH868AMlEDJkggYPx+wLbMVukk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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