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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb6d09a9b51692e135484f0068180f0851a7c9cb9634059ff68da087976debb' 
  AND token = 'F8nTdbKvz7enZOS7eEPpn1VsmDwN5ZpCdqja7zUrND8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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