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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b79678fb032b9a85d4bc61502ebe65d5c794037ec28906c90f6056ec30bd60' 
  AND token = 'vBiFOvICe1cLq6WYa7izhhLD/zVzFetagOdXz5LLA/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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