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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993a788a9addd638dab0f3720dcb5a9d83722894be568d049da8f6929ce42ee3' 
  AND token = 'GS5X1KSGR0dBtxnmLbzY5OumPIXtHfZiC8/7U5uoiH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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