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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e897110aba6f3b7ceaea31c32e7ac84f4db0977df716a1725af63a48f298cb' 
  AND token = 'EiHTRzNFH4QJRjJk5jwcrihTs6m5rbr2pFKu09Gnl3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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